Monitoring system, monitoring device, monitoring method, and non-transitory computer-readable medium

Abstract

A monitoring system according to the present disclosure includes an optical fiber (10) laid on a ground or a seabed, an optical fiber sensing unit (21) configured to receive an optical signal from the optical fiber (10) and detect a vibration produced in the ground or the seabed based on the optical signal, and an analyzing unit (22) configured to identify a natural phenomenon that has caused the detected vibration based on a unique pattern of the detected vibration.

What is claimed is: 
     
       1. A monitoring system comprising:
 an optical fiber laid on a ground or a seabed; 
 an optical fiber sensing unit configured to receive an optical signal from the optical fiber and detect a vibration produced in the ground or the seabed based on the optical signal; and 
 an analyzing unit configured to identify a natural phenomenon that has caused the detected vibration based on a unique pattern of the detected vibration, 
 wherein the analyzing unit is configured to;
 identify the natural phenomenon that has caused the detected vibration based on the unique pattern of the detected vibration using a trained model; 
 calculate a rate of match of the unique pattern of the detected vibration against a plurality of predetermined vibration patterns; 
 determine whether the unique pattern matches any of the plurality of predetermined vibration patterns based on the calculated rate of match; and 
 classify the natural phenomenon based on the calculated rate of match. 
 
 
     
     
       2. The monitoring system according to  claim 1 , wherein the analyzing unit is configured to:
 calculate a direction of propagation and a speed of propagation of the detected vibration based on the unique pattern of the detected vibration and the distribution of the unique pattern; and 
 identify a position of a vibration source of the detected vibration based on the calculated direction and speed. 
 
     
     
       3. The monitoring system according to  claim 1 , wherein the optical fiber sensing unit is configured to further detect at least one of a sound or a temperature produced in the ground or the seabed based on the optical signal received from the optical fiber, and
 wherein the analyzing unit is configured to identify the natural phenomenon that has caused the detected vibration based on the unique pattern of the detected vibration and a unique pattern of at least one of the detected sound or the detected temperature. 
 
     
     
       4. The monitoring system according to  claim 1 , wherein the analyzing unit is configured to predict whether a predetermined natural phenomenon will occur in future based on a change over time in the unique pattern of the detected vibration. 
     
     
       5. The monitoring system according to  claim 1 , wherein the analyzing unit is configured to classify the natural phenomenon into one of an earthquake, a volcanic tremor, or a crustal movement. 
     
     
       6. The monitoring system according to  claim 1 , wherein the analyzing unit is configured to compare the rate of match of the unique pattern against a threshold for identifying the natural phenomenon. 
     
     
       7. The monitoring system according to  claim 1 , wherein the optical fiber is laid two-dimensionally on the ground. 
     
     
       8. The monitoring system according to  claim 7 , wherein the analyzing unit is configured to determine a hypocenter of the natural phenomenon using a detected two-dimensional distribution of the unique pattern of detected vibration. 
     
     
       9. The monitoring system according to  claim 1 , wherein the ground is a seabed. 
     
     
       10. A monitoring device comprising:
 an optical fiber sensing unit configured to receive an optical signal from an optical fiber laid on a ground or a seabed and detect a vibration produced in the ground or the seabed based on the optical signal; and 
 an analyzing unit configured to identify a natural phenomenon that has caused the detected vibration based on a unique pattern of the detected vibration, 
 wherein the analyzing unit is configured to:
 identify the natural phenomenon that has caused the detected vibration based on the unique pattern of the detected using a trained model; 
 calculate a rate of match of the unique pattern of the detected vibration against a plurality of predetermined vibration patterns; 
 determine whether the unique pattern matches any of the plurality of predetermined vibration patterns based on the calculated rate of match; and 
 classify the natural phenomenon based on the calculated rate of match. 
 
 
     
     
       11. The monitoring device according to  claim 10 , wherein the analyzing unit is configured to:
 calculate a direction of propagation and a speed of propagation of the detected vibration based on the unique pattern of the detected vibration and the distribution of the unique pattern; and 
 identify a position of a vibration source of the detected vibration based on the calculated direction and speed. 
 
     
     
       12. The monitoring device according to  claim 10 , wherein:
 the optical fiber sensing unit is configured to further detect at least one of a sound or a temperature produced in the ground or the seabed based on the optical signal received from the optical fiber, and 
 the analyzing unit is configured to identify the natural phenomenon that has caused the detected vibration based on the unique pattern of the detected vibration and a unique pattern of at least one of the detected sound or the detected temperature. 
 
     
     
       13. The monitoring device according to  claim 10 , wherein the analyzing unit is configured to predict whether a predetermined natural phenomenon will occur in future based on a change over time in the unique pattern of the detected vibration. 
     
     
       14. A monitoring method to be performed by a monitoring device, the monitoring method comprising:
 an operation of receiving an optical signal from an optical fiber laid on a ground or a seabed and detecting a vibration produced in the ground or the seabed based on the optical signal; and 
 an operation of identifying a natural phenomenon that has caused the detected vibration based on a unique pattern of the detected vibration, 
 wherein the analyzing unit is configured to:
 identify the natural phenomenon that has caused the detected vibration based on the unique pattern of the detected vibration using a trained model; 
 calculate a rate of match of the unique pattern of the detected vibration against a plurality of predetermined vibration patterns; 
 determine whether the unique pattern matches any of the plurality of predetermined vibration patterns based on the calculated rate of match; and 
 classify the natural phenomenon based on the calculated rate of match.